/*==================================================
    License (http://www.opensource.org/licenses/mit-license.php)

    Copyright (c) 2006 Patrick Fitzgerald

    Permission is hereby granted, free of charge, to any person
    obtaining a copy of this software and associated documentation files
    (the "Software"), to deal in the Software without restriction,
    including without limitation the rights to use, copy, modify, merge,
    publish, distribute, sublicense, and/or sell copies of the Software,
    and to permit persons to whom the Software is furnished to do so,
    subject to the following conditions:

    The above copyright notice and this permission notice shall be
    included in all copies or substantial portions of the Software.

    THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
    EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
    MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
    NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
    BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
    ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
    CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
    SOFTWARE.
    ==================================================*/

function TabberObj(argsObj) {
    "use strict";

    var arg; /* name of an argument to override */

    /* Element for the main tabber div. If you supply this in argsObj,
       then the init() method will be called.
    */
    this.div = null;

    /* Class of the main tabber div */
    this.classMain = "tabber";

    /* Rename classMain to classMainLive after tabifying
       (so a different style can be applied)
    */
    this.classMainLive = "tabberlive";

    /* Class of each DIV that contains a tab */
    this.classTab = "tabbertab";

    /* Class to indicate which tab should be active on startup */
    this.classTabDefault = "tabbertabdefault";

    /* Class for the navigation UL */
    this.classNav = "tabbernav";

    /* When a tab is to be hidden, instead of setting display='none', we
       set the class of the div to classTabHide. In your screen
       stylesheet you should set classTabHide to display:none.  In your
       print stylesheet you should set display:block to ensure that all
       the information is printed.
    */
    this.classTabHide = "tabbertabhide";

    /* Class to set the navigation LI when the tab is active, so you can
       use a different style on the active tab.
    */
    this.classNavActive = "tabberactive";

    /* Elements that might contain the title for the tab, only used if a
       title is not specified in the TITLE attribute of DIV classTab.
    */
    this.titleElements = ['h2','h3','h4','h5','h6'];

    /* Should we strip out the HTML from the innerHTML of the title elements?
       This should usually be true.
    */
    this.titleElementsStripHTML = true;

    /* If the user specified the tab names using a TITLE attribute on
       the DIV, then the browser will display a tooltip whenever the
       mouse is over the DIV. To prevent this tooltip, we can remove the
       TITLE attribute after getting the tab name.
    */
    this.removeTitle = true;

    /* If you want to add an id to each link set this to true */
    this.addLinkId = false;

    /* If addIds==true, then you can set a format for the ids.
       <tabberid> will be replaced with the id of the main tabber div.
       <tabnumberzero> will be replaced with the tab number
           (tab numbers starting at zero)
       <tabnumberone> will be replaced with the tab number
           (tab numbers starting at one)
       <tabtitle> will be replaced by the tab title
           (with all non-alphanumeric characters removed)
     */
    this.linkIdFormat = '<tabberid>nav<tabnumberone>';

    /* You can override the defaults listed above by passing in an object:
         var mytab = new tabber({property:value,property:value});
    */
    for (arg in argsObj) {
        if (argsObj.hasOwnProperty(arg)) {
            this[arg] = argsObj[arg];
        }
    }

    /* Create regular expressions for the class names; Note: if you
       change the class names after a new object is created you must
       also change these regular expressions.
    */
    this.REclassMain = new RegExp('\\b' + this.classMain + '\\b', 'gi');
    this.REclassMainLive = new RegExp('\\b' + this.classMainLive + '\\b', 'gi');
    this.REclassTab = new RegExp('\\b' + this.classTab + '\\b', 'gi');
    this.REclassTabDefault = new RegExp('\\b' + this.classTabDefault + '\\b', 'gi');
    this.REclassTabHide = new RegExp('\\b' + this.classTabHide + '\\b', 'gi');

    /* Array of objects holding info about each tab */
    this.tabs = [];

    /* If the main tabber div was specified, call init() now */
    if (this.div) {
        this.init(this.div);

        /* We don't need the main div anymore, and to prevent a memory leak
           in IE, we must remove the circular reference between the div
           and the tabber object. */
        this.div = null;
    }
}

/*--------------------------------------------------
    Methods for TabberObj
  --------------------------------------------------*/

TabberObj.prototype.init = function(e) {
    "use strict";

    /* Set up the tabber interface.

       e = element (the main containing div)

       Example:
       init(document.getElementById('mytabberdiv'))
    */

    var childNodes, /* child nodes of the tabber div */
        i, i2, /* loop indices */
        t, /* object to store info about a single tab */
        defaultTab=0, /* which tab to select by default */
        DOM_ul, /* tabbernav list */
        DOM_li, /* tabbernav list item */
        DOM_a, /* tabbernav link */
        aId, /* A unique id for DOM_a */
        headingElement; /* searching for text to use in the tab */

    /* Verify that the browser supports DOM scripting */
    if (!document.getElementsByTagName) {
        return false;
    }

    /* If the main DIV has an ID then save it. */
    if (e.id) {
        this.id = e.id;
    }

    /* Clear the tabs array (but it should normally be empty) */
    this.tabs.length = 0;

    /* Loop through an array of all the child nodes within our tabber element. */
    childNodes = e.childNodes;
    for (i=0; i < childNodes.length; i++) {
        
        /* Find the nodes where class="tabbertab" */
        if(childNodes[i].className &&
             childNodes[i].className.match(this.REclassTab)) {

            /* Create a new object to save info about this tab */
            t = {};

            /* Save a pointer to the div for this tab */
            t.div = childNodes[i];

            /* Add the new object to the array of tabs */
            this.tabs[this.tabs.length] = t;

            /* If the class name contains classTabDefault,
               then select this tab by default.
            */
            if (childNodes[i].className.match(this.REclassTabDefault)) {
                defaultTab = this.tabs.length-1;
            }
        }
    }

    /* Create a new UL list to hold the tab headings */
    DOM_ul = document.createElement("ul");
    DOM_ul.className = this.classNav;

    /* Loop through each tab we found */
    for (i=0; i < this.tabs.length; i++) {

        t = this.tabs[i];

        /* Get the label to use for this tab:
             From the title attribute on the DIV,
             Or from one of the this.titleElements[] elements,
             Or use an automatically generated number.
         */
        t.headingText = t.div.title;

        /* Remove the title attribute to prevent a tooltip from appearing */
        if (this.removeTitle) { t.div.title = ''; }

        if (!t.headingText) {

            /* Title was not defined in the title of the DIV,
               So try to get the title from an element within the DIV.
               Go through the list of elements in this.titleElements
               (typically heading elements ['h2','h3','h4'])
            */
            for (i2=0; i2<this.titleElements.length; i2++) {
                headingElement = t.div.getElementsByTagName(this.titleElements[i2])[0];
                if (headingElement) {
                    t.headingText = headingElement.innerHTML;
                    if (this.titleElementsStripHTML) {
                        t.headingText.replace(/<br>/gi," ");
                        t.headingText = t.headingText.replace(/<[^>]+>/g,"");
                    }
                    break;
                }
            }
        }

        if (!t.headingText) {
            /* Title was not found (or is blank) so automatically generate a
               number for the tab.
            */
            t.headingText = i + 1;
        }

        /* Create a list element for the tab */
        DOM_li = document.createElement("li");

        /* Save a reference to this list item so we can later change it to
             the "active" class */
        t.li = DOM_li;

        /* Create a link to activate the tab */
        DOM_a = document.createElement("a");
        DOM_a.appendChild(document.createTextNode(t.headingText));
        DOM_a.href = "javascript:void(null);";
        DOM_a.title = t.headingText;
        DOM_a.onclick = this.navClick;

        /* Add some properties to the link so we can identify which tab
             was clicked. Later the navClick method will need this.
        */
        DOM_a.tabber = this;
        DOM_a.tabberIndex = i;

        /* Do we need to add an id to DOM_a? */
        if (this.addLinkId && this.linkIdFormat) {

            /* Determine the id name */
            aId = this.linkIdFormat;
            aId = aId.replace(/<tabberid>/gi, this.id);
            aId = aId.replace(/<tabnumberzero>/gi, i);
            aId = aId.replace(/<tabnumberone>/gi, i+1);
            aId = aId.replace(/<tabtitle>/gi, t.headingText.replace(/[^a-zA-Z0-9\-]/gi, ''));

            DOM_a.id = aId;
        }

        /* Add the link to the list element */
        DOM_li.appendChild(DOM_a);

        /* Add the list element to the list */
        DOM_ul.appendChild(DOM_li);
    }

    /* Add the UL list to the beginning of the tabber div */
    e.insertBefore(DOM_ul, e.firstChild);

    /* Make the tabber div "live" so different CSS can be applied */
    e.className = e.className.replace(this.REclassMain, this.classMainLive);

    /* Activate the default tab, and do not call the onclick handler */
    this.tabShow(defaultTab);

    return this;
};


TabberObj.prototype.navClick = function(event) {
    "use strict";

    /* This method should only be called by the onClick event of an <A>
       element, in which case we will determine which tab was clicked by
       examining a property that we previously attached to the <A>
       element.

       Since this was triggered from an onClick event, the variable
       "this" refers to the <A> element that triggered the onClick
       event (and not to the TabberObj).

       When TabberObj was initialized, we added some extra properties
       to the <A> element, for the purpose of retrieving them now. Get
       the TabberObj object, plus the tab number that was clicked.
    */

    var rVal, /* Return value from the user onclick function */
        a, /* element that triggered the onclick event */
        self, /* the tabber object */
        tabberIndex, /* index of the tab that triggered the event */
        onClickArgs; /* args to send the onclick function */

    a = this;

    if (!a.tabber) {
        return false;
    }

    self = a.tabber;
    tabberIndex = a.tabberIndex;

    /* Remove focus from the link because it looks ugly.
       I don't know if this is a good idea...
    */
    a.blur();

    /* If the user specified an onClick function, call it now.
       If the function returns false then do not continue.
    */
    if (typeof self.onClick === 'function') {
        onClickArgs = {'tabber':self, 'index':tabberIndex, 'event':event};

        /* IE uses a different way to access the event object */
        if (!event) {
            onClickArgs.event = window.event;
        }

        rVal = self.onClick(onClickArgs);
        if (rVal === false) { return false; }
    }

    self.tabShow(tabberIndex);

    return false;
};


TabberObj.prototype.tabHideAll = function() {
    "use strict";

    var i; /* counter */

    /* Hide all tabs and make all navigation links inactive */
    for (i = 0; i < this.tabs.length; i++) {
        this.tabHide(i);
    }
};


TabberObj.prototype.tabHide = function(tabberIndex) {
    "use strict";

    var div;

    if (!this.tabs[tabberIndex]) {
        return false;
    }

    /* Hide a single tab and make its navigation link inactive */
    div = this.tabs[tabberIndex].div;

    /* Hide the tab contents by adding classTabHide to the div */
    if (!div.className.match(this.REclassTabHide)) {
        div.className += ' ' + this.classTabHide;
    }
    this.navClearActive(tabberIndex);

    return this;
};


TabberObj.prototype.tabShow = function(tabberIndex) {
    "use strict";

    /* Show the tabberIndex tab and hide all the other tabs */

    var div;

    if (!this.tabs[tabberIndex]) {
        return false;
    }

    /* Hide all the tabs first */
    this.tabHideAll();

    /* Get the div that holds this tab */
    div = this.tabs[tabberIndex].div;

    /* Remove classTabHide from the div */
    div.className = div.className.replace(this.REclassTabHide, '');

    /* Mark this tab navigation link as "active" */
    this.navSetActive(tabberIndex);

    /* If the user specified an onTabDisplay function, call it now. */
    if (typeof this.onTabDisplay === 'function') {
        this.onTabDisplay({'tabber':this, 'index':tabberIndex});
    }

    return this;
};

TabberObj.prototype.navSetActive = function(tabberIndex) {
    "use strict";

    /* Note: this method does *not* enforce the rule
       that only one nav item can be active at a time.
    */

    /* Set classNavActive for the navigation list item */
    this.tabs[tabberIndex].li.className = this.classNavActive;

    return this;
};


TabberObj.prototype.navClearActive = function(tabberIndex) {
    "use strict";

    /* Note: this method does *not* enforce the rule
       that one nav should always be active.
    */

    /* Remove classNavActive from the navigation list item */
    this.tabs[tabberIndex].li.className = '';

    return this;
};

(function tabberAutomatic() {
    "use strict";

    /* This function finds all DIV elements in the document where
       class=tabber.classMain, then converts them to use the tabber
       interface.

       tabberArgs = an object to send to "new tabber()"
    */
    var tempObj, /* Temporary tabber object */
        divs, /* Array of all divs on the page */
        i, /* Loop index */
        tabberArgs = {};

    /* Create a tabber object so we can get the value of classMain */
    tempObj = new TabberObj(tabberArgs);

    /* Find all DIV elements in the document that have class=tabber */

    /* First get an array of all DIV elements and loop through them */
    divs = document.getElementsByTagName("div");
    for (i=0; i < divs.length; i++) {

        /* Is this DIV the correct class? */
        if (divs[i].className &&
	divs[i].className.match(tempObj.REclassMain)) {

            /* Now tabify the DIV */
            tabberArgs.div = divs[i];
            divs[i].tabber = new TabberObj(tabberArgs);
        }
    }
})();